Process of making steel castings.



NlTE-D STATES PATENT OFFICE.

ASSIGNMENTS, TO THE UNITED STATES STEEL COMPANY,

PLACE.

OF SAME PROCESS OF MAKING STEEL CASTINGS.

SPECIFICATION forming part of Letters Patent No. 648,509, dated May 1, 1900.

Application filed January 19, 1899. Serial No. 702,741. (No specimens.)

To aZZ whom it may concern:

Be it known that I, ANDRES G. LUNDIN, a subject of the King of Sweden and Norway, residing in Boston, in the county of Suffolk and State of Massachusetts, have invented a certain new and useful Process of Making Steel Castings, of which the following is a specification. v

This invention relates to the manufacture of steel castings from steel scrap whereby a new or improved description of steel possessing toughness and hardness to an unusual degree and other valuable peculiarities is produced.

The mode of practicing my invention is as follows: First, the steel scrap is placed in a crucible in a furnace and melted to a boilingpointsay about et,OO0 Fahrenheit-or it may be melted by the open-hearth process; second, a small quantity or percentage of ferrosilicon containing, preferably, twelve (12) per cent. of silicon is crumbled and placed in the molten mass of metal; third, a Wait of, say, ten minutes is made in order to give the ferrosilicon time to melt and mix with the melted metal; fourth, a small quantity of ferromanganese, rich in manganese and containing, say,eightyper cent. of manganese,is crumbled and placed with a small portion of crumbled orbroken aluminium and the mixture dropped into the molten mass of metal, where it quickly melts, and, fifth, the molten mass of metal or alloy is poured into the'mold.

The process comprising the above steps is particularly for the production of light-weight steel castings, such as for chisels and similar tools or bicycle parts.

In practice I find it advisable to heat the ferrosilicon and the copper before throwing them into the molten mass in the crucible in order that the portion of the mass next such ingredients may not become chilled and the process retarded. This preliminary heating of these ingredients is to a com paratively-low temperature and of course not to a meltingpoint, and it may be done, if desired, while the scrap is melting.

The proportions used in the above-described process are as follows: steel scrap, one hundred pounds; ferrosilicon, one and one-half to two and one-half pounds; ferromanganese, two to eight ounces; aluminium, three pounds or less.

Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is-

The process herein described for manufacturing steel castings, which consists in heating steel scrap in a furnace and melting the same to substantially a boiling-point; heating to a moderate degree a small percentage of ferrosilicon and then inserting the same in the molten metal; allowing sufficient time for the ferrosilicon to become melted and mixed with the molten metal; inserting in the molten metal substantially simultaneously small quantities of ferromanganese and aluminium; and pouring the molten mass of metal or alloy into a mold in the usual manner, substantially as described.

ANDRES G. LUNDIN. Witnesses:

HENRY W. WILLIAMs, A. N. BONNEY. 

